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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f672b559a9a417ed7cab40566711d951fdb7cc158bc3e71911f4fcb7237565' 
  AND token = '7gqVDIEXT7HArKdEXs4/HNUdvoUB5j5e7Ihfx3srx6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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