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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '612d2ec45217b2ee8d163bd206b366a7f25e93d8ed46bc400270e12cdbe1c814' 
  AND token = 'fWMi2T+x/0X7lngxlS1ReHlS8iYDZpoFtUI97EIU/jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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