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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e6ee543aac5c9bca9e7732f62aeed855e1ce93d021b40170fc624d06dbb795' 
  AND token = '1Z6LR4fH8m+lon8NZwZopOgNIydb+01iEqL8q5Y+VPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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