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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb7f8e55adaae7d3be38b0cc8ed56440bcac576adfad4665882c3a64ea1750c2' 
  AND token = 'Uyv9+fcNR3YPiBF+TTXEOGdpMybEwgfUPtZ1jQD+Cxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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