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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c484debe86dbc9a981cfc247c5d1b10cd16aadb854229e13aadedcfc0f45ce1f' 
  AND token = 'SLaqOWFQ6A8oWQLmX5BfwczT1W75LEBk8CNATzLvQqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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