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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6d90b8c5252d8896f33a98009d03bdb5708f5b5095b82a1c71466493268dc0e' 
  AND token = 'wfmzTs/8KLVpPMPhSck0O60+kbe45i1eYVCz+em3AAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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