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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5477d51f414ec47465c35e0695194bb697ff93bab266a1661d3d4e5f7ebd8472' 
  AND token = 'qyYBL5xUTQFQpFgoKbEBL1irSOQ5Ss1qNeAijkFbcNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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