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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a9eb00344c8d96251bb2a11aabc0d057df5d4d602e6c8b6d377fe3978d86819' 
  AND token = '4ycQ3cXroRaFPU/HCC0wTrSPcky2BGJeyDrE8QvG4jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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