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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2927ec24086b65180edae71a5e5479bc2a0f3b4c03bea6345cbadd0d1853af50' 
  AND token = '8seDPcR+gQra5/uTDldN+thd2wMV2aZCbTsOqZSfPNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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