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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2c60afe6202b39cf202f6ddfa95721d0af443536dd68cf495153fa3e37063ad' 
  AND token = 'M7L5hBFViYPH+dCNDcrZnJMp5EOIc+xx2V2f7M2T94g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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