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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0bfec153532a5b8ca56e6945ae51df9e54f2feae304a665f9d637b7563d6bd6' 
  AND token = 'UIlK3SHjAL5jmB7lFrex1D+Zf2Xs4O6vbRNd38pJEPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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