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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ad0fdb1b84ce16bc1c62aa3f4b493751023b99a7c95bb015ef8aa608b9a5bb0' 
  AND token = '/ordG/VHfYpgse2ZJvBJb1UlSCS1yBpORRtkhYFeZno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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