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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bdbe3fde48acbd270263c655e10fa63b9a2938601dabec2aaaa3c5b4bbcff15' 
  AND token = '12t5tr8Alt1bYvTKWLw+q3MGEDmdkjt4KMyCHBUhkao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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