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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57d03e0419725a8a2f9ba37633523334e5648ac3b9b4c2438b56dc31663ded0a' 
  AND token = 'Mbr8yMjQPWX1cY/XctEQSV8c3KHQgNxgH+LRTll/P2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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