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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41ce46cb40aad274c8e55ac13496847a5fcf194d5938e9715fa35b1ee13c3d94' 
  AND token = 'EhGMjMbNWAcZbKCSB3qmbjhg+22qXC1WTJAy0Izj1Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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