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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1d2f697d9b60464e668b94260d16574709144084abf444bdd6902a3b0ccfb9d' 
  AND token = '+mcgXBzJbWo8yMK8WVy5/bqHPD65HaWMCLVeKc2qg4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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