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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093b19068debed65440777d9871a3bfa9c2d718caa5f74c474983c5535f20f88' 
  AND token = 'nZDg5a+VFD5b8tTdapwoLRcViRWosB0kIN+VT80cdQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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