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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b410687ffe09c98106bea66f2b93c56bc8a4778cd4c32d0031423cff6b28b0ed' 
  AND token = 'YKG5D9wSh/A7orwYYobS9kEaUOfGqmDnSjAG9iDOtS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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