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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8832b3c968722f6ba4ce2cc0fedcf356cf37a7ea2e5edf34364630c8d59caa48' 
  AND token = 'X6FdbtR2TYG9+7SGg9fNeb3X56/fAFPv3+dOiQY9FiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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