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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a509406c716bd09416e3a355388d3addc953b3c3835f7c819cc2055bfc1efee' 
  AND token = 'nVymuisbA4rhaEa/izlbzzsfe9zxG3Qh5qg65egXXzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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