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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7cb6b5add2973cec45ba52a3e26617b192382940dde4ef5eaa10b5216250cd4' 
  AND token = '11+bCaSIxTAg7GB/Pb34AmbexvsphSE1Ild156Rqk7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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