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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adeacad54918ec3b0c603c2d202358b55adc7f103050c154135f5984d14cabd7' 
  AND token = '59cE/qWez33I4x+aLVdDjV2tu8tLgck+6pDbODx+QGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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