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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f70550ed7443b62545cb5d8a64e4627e4101a522414fbbca57f71df7c651461c' 
  AND token = 'X4BVe87A01V0Dw7uHzOvJIjRThuN/aNJHZUDA51g9fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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