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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1270cb420f89e0188707d1622eada5f01a5d49ccc71eccf1ab89b5daec1c41bb' 
  AND token = 'Yv97V0oM2tFrYJ7XmiPENkzJdfZa+pyDejyLVNbg2/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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