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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3d94db115df538dc2a6af4b8eeb93a980672d1c979a2b53362f6df0baf6a6f8' 
  AND token = 'E061yyYzUCkoV3XRISULMFmhfCseOKz1jLgCmDsp+D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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