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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48666907c4818c0446e4313117914253c0cd752b682cb699734c967917fb749b' 
  AND token = '/8KvFb6z46ktPxtN968PFIXwIEuFlb/tE8F58H4a9j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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