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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df6e174b4da7474d4edbdf03a8a44be21b30b33e8c227fb00ac27f973ab9b2f9' 
  AND token = 'N8QkvjK4ELToJO5bARRDri3WGN1NIg1JM4gEXr45g0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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