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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e7a5b222d6988e292197f589d15aa7acdd1b06f3d34726fcaf4f27f8067b0df' 
  AND token = 'AEMDmjFqGZ4JtKAfCTLa+GRvJ7BX3JEEQ23kf3ODpTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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