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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d2ccb6b430134a0dd5d38e712a605555a6d119e5ef4d965850765c1d29f6717' 
  AND token = 'Z7alhwrD09C5rd2gHXOTtoMOWhLi4IX3bjB5WUwH3Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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