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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0f68a6ebf81d194814b120ce4b25b895854f3d2e27b2186dd8b0741e1ffa593' 
  AND token = 'c+n73IirQ0nnewpmobWqde1TmAJGKQ4ZjBOdhsXeW1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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