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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a05aa4e2d4047065c8c82c719cd0f79d255262d4467a389ea30195a5134f288c' 
  AND token = 'EEGnIYpoKHklH9uJcuZS9CtWrJoVgod0Vu0xNgozels=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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