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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a27d662a1f55e4203e4fe8306f1272e92ad0fb751b5090f58499c4131be6be9' 
  AND token = 'ofF6Ga2iNNeeIKxZx1bufs819GyoKAobf52VC0Sg50Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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