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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9c428452d017955a14cbd2071dce2c764d30e7fac1f7e3213ad26a2e5590dc' 
  AND token = 'T7f4GFbLcwIrW0hz/pdN4r3ih3Su/YbWi3WNPJJoy6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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