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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5ab86b4e83c6b3d34f24cbd8896a85319e2f5ed3e5639a558f504c87d637783' 
  AND token = 'E+GeRTIz5Eu2ZJUNTDBAUQ010B8bb9DR7KVSMkDB8bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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