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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b013a0955720234fd578e19657130b8723d9e9b56d8533a88dc08670ae8d97d' 
  AND token = 'ezwG9QBSMzPBuwzgRRpUrGoz5jIhIsHF/Pcz6IoY858=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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