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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2deb94c5c260f26c7ea525ec0e24b8cbb12cce9fc42419e57316b7579515d50' 
  AND token = 'Bjj9sfy4WB09U/sRYOZxPjX0hB5xHsVPfBFI02SRzP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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