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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e244aca9118848a650395cb21b2e060379ce65f46d34c2228d87024492a6d6db' 
  AND token = 'B0h7ksGXNGKsYWL+ZxygcA+vpJEX95J68S59pcyy4m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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