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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f52226dbec21bb8d56ab59651af650fba109898eee91b744fd3b38b418f6608d' 
  AND token = '0H/GcIo4XIIkxE+Q1lTMbz2pbQbNaEKe3p4oTILQqF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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