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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b4c3e14afb1734aad44947df475e4a7507f06db1b813ee2a2d63e3aec88e785' 
  AND token = 'vLRaCj5/dX8LVZD1Ec3adRJMa0B/ll8b+JWu6HoAV7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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