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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33263e192a5e24e2e98f506e1de65b8f2543694f3d19b4d5eef99254812aec83' 
  AND token = 'jl9XjQwlY3lGf/kz/6gTOTP5hlYVdY0zMphRqAsE11c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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