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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c3c77c44f64f14c9c2295b466ec7c804cbafd4ccfd9f4b6b00980ff2b158dbd' 
  AND token = 'j6bJd35t/ScDpWFWFcwbuywtVOvdvDTwL/lxH+O6IWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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