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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc61bcb4975baf316e68abc2cf7ee86b8716ccf9a5d5237d3113c0f8501965b2' 
  AND token = '6tck18/Fb+a6lE3wx2MLjGd42j0Fln0zzf+j7KHBWuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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