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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0005208a8220d0b1aa6cd0071c2b67c556b20bc6d51bbb4e2302135eaf3476b' 
  AND token = 'oG1Sn/kb8VjecImy75bCtZ3QlckOOuwdJS/NfgRZp5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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