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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96abc4b9b92cf55320ca525b0409ffe5a31e6262b3e7cc4d3c169c1c3819ad1d' 
  AND token = 'YPk4Vq6MSI4TsZivOyXdHMWcGT56IJeazaikWVSyYPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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