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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5913d4cd21d1e127d010cda5912e04228ae90425ffd5e7fa4c4538afd4383d2' 
  AND token = 'AaSElFkQzjWEJB/coy5I3Lxp/Ru7tKTvgOzs754Z5Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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