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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '756817607ff105657e2c91ae2d3287028ef8a67737774aaec70d6431d9a4e865' 
  AND token = 'dVEmKPu+OlG4dGrSQhU9WRHaR/bukUJBBEv87C6Ujiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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