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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77ea85344eec25a5478c7d8abded6284e86d5d48b2dafa4dc0e92b6b0704b8b4' 
  AND token = 'XPzNn7Av/ylDsBve8JX2kGAqW9Cr3unT17cPMyujH1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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