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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbcaf5bf0b666089dd2b84e012a04f38360858f8aee06ed6f749c3b7eb8c1b35' 
  AND token = 'Bw75vbjMo+s5BOoc+0qLWFBm9hksk63m266trfXy+Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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