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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9be2a227f39b773d98caf1906e471b9dd4f764588ac414911f7ad9fa05cf2fa5' 
  AND token = 'HH5mLhfamMbDeeiqOfCKv80oyvFpQgZLeSUPgzJVkyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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