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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee344eb51e948fd3e91893e05765efcfd1ff500d771d08b96cb0af4e5353b43' 
  AND token = 'VB9z+AoPlMBFiYDtgt1cur+A451OswybMwdendrRsoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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