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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85612446d6d27d400c767a2c5700217e39125d07f3c7a2caf0dc7ff1f9bb35b9' 
  AND token = 'vLT9QzswG206b4GfK5bWKU/4i+ISPrD7M/+4Z2yR44c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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