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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0326db78af68c4521a7eb7cc1848e3f8ef5b77ced9a19bc4e71a4d1f2e58b76' 
  AND token = 'jBf4567fruG7V+3iBw12ouNXCG2iPgAj0NPcZpYfgNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}