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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84a8a5ace277b3d1d78657e188ca5110b9b119223da0c0bbd729d88512be3264' 
  AND token = '6hIVCYccMWgBn/KLvijJFLauL3K2J/1TPbIfA3oaCdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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