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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b15e2029f9c61663a22d0a7d4dc41dcef5f21373ad77c93062d4ad3243f32c44' 
  AND token = 'iKicC41i2xT0ZPH/KxmZOSurX4QEQbL3vUtgilXatvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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