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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc737a6391a7a4f1b27b391255da07e0d5bdcb054b776cf5dd33b599d24b249' 
  AND token = 'RSiAdqtpNpAPQRzpG2MZTZzmm/uHW9jS398o0fVMGAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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